Casing of a water purifier apparatus



FIG. 1 is a perspective front view of the casing;

FIG. 2 is a perspective view thereof from the left front;

FIG. 3 is a perspective view thereof from the right front;

FIG. 4 is a rear perspective view thereof; and,

FIG. 5 is a top plan view thereof. 

The ornamental design for a casing of a water purifier apparatus, as shown and described. 